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H. A. SHIPMAN ANn'ir 'n. HENDBYX, OF ANSONIA, CONNECTICUT. LettersPatent No. 62,293, dated February 19, 1867.

IMPROVEMENT IN- MACHINES roe EXTENDING TUBING.

'lO ALL WHOM 1'1 MAY CONCERN: r

Be it. known that we, H. A. Snrrunn' and A. B. HENDRYX, of Ansonia, inthe county of New Haven, and State of Connecticut, have invented a newImprovement in the Manufacture of Seamless Tubing; and we do herebydeclare the following, when taken in connection with the accompanyingdrawings, and the letters of refercnce marked thereon, to be ufull,elem, end enact description ofthe same, and which said drawingsconstitute part of this specification, and represent, iu-

Figure 1, a side view of the apparatus by which our improvement in themanufacture of seamless tubing is accomplished.

Figure 2, a vertical central section.

Figure 3, a cross-section cutting through line 212;; and in Figures 4,5, 6, and 7, detached views to illustrate its operation.

Our invention relates to an improvement in the manufacture of tubingfrom brass, copper, or kindred metals which are capable of being drawnor extended, so that the length of the tube is increased by thereduction of the thickness of the metal consequent upon such drawing,and our invention consists in compressing a. portion of the tube, (whichis of nearly tho'required internal diameter,) from the outside by meansof dies, and holding the compression while u follower'upon the inside ofthe tube, of the diameter required forthe tube, strikes or pressesaxially with the tube upon the compressed portion, forcing its waythrough the said compressed portion, thereby elongating the tubeproportionately to the compression, then by the withdrawal of thefollower or mandrel an adjoining portion is in like manner treated untilthe whole is drown to the extent required.

To enable others skilled in the art. to thus manufacture tubing, we willproceed to describe our manner oi so doing as illustrated in theaccompanying drawings.

A is the bed-plate, supported upon four columns 13, a steam cylinder, C,through i which passes a. piston rod, 1), attached to a {mist-011,13,and operated by steam admitted to the steam chest F in the usual mannerfor operating common steam hammers. G G are two slides, (sec fig. 7,)movable in guides H H to open, as denoted in red fig T, and as seen infig. 5, by sprin'gs I or their equivalent, and are closed by the descentof slides L moving vertically in guides K, which said slides areconnected by :i cross-bond, M, to the piston-rod D, as seen i in fig. 2.In their descent the inclined ends of the said slide L enter behind eachof and so as to close the slides (in us denoted in figs. (5 and 7. Thesaid slides G have fitted to or formed upon their inner ends diescorresponding to the external surface of the tube to he formed, as soonin fig. T. N is a. mandrel or follower, attached to or mode a purl. ofthe piston-rod l), and of the diameter required for the interior of thetube to be formed. 0 is a. plate, supported so as to slide frccly uponthe columns 13, and through which the'pistou passes freely. On the saidplate and surrounding the mandrel, we arrange a conical ring, a, slottcdso as to diminish in diameter .as it is pressed further into the socketin which it is placed fol-the purpose hereafter shown. The said plate ismoved down by the opcrntionof u slotted guide, P, (soc fig. 4,) fixed toone of the slides L, as seen in figs. 1, 2, mid. 3, operating upon alover, I), which carries: a pawl, c, that acts upon a. ratchet, d, fixedto a. shaft, E, and by the movement of the lever b,'cs from the positionin block to that dcnoted in red, fig. 3, caused by the descent of theslide in, as from the position in red to that denoted in black, fig. 2,the shaft B. is caused to make u pnrtia-l revolution, which by anarrangement of goers in immediate connection causes it partial IGVOlution of the screw S, which said screw operatesupon the pinto O, togiro to it a. downward movement in proportion to the extent of theturning of the said screw. The conical ring a is also connected to saidshaft R by goal-eff, (see 2 and 3,) so as to have in rotating movementindependent of the plate 0. The

plate 0 is put in connection with or so as to be moved by'tho screw S,by u hinged nut, h ll, so that when the said hinged nut is closed asdenoted in black, the plate-O will more by the notion of the screw, orwhen the nut is open, as denoted in red, the movement of'the plate 0, bythe notion of the screw, ccasos .-tlicn the plate 0 may be freely movedup or down as occosionmay require.

The operation of the mix-chino thus constructed is as follows: Preparea. short hollow tubc'oi' metal in the usual manner for the manufactureof tubing, its internal diameter corresponding to the size of themandrel N, which must be of the internal diameter of the tube to beproduced, thet. is. to say, the metal should he as much thicker than therequired thickness when finished, ns will afford sufiiciont'motnl toextend the tube to the length and thickness required. Place the metalthus formed over the mandrel and within the grasp of the conical ring a;then force the ring a into its socket to securely attachthe metal to theplate 0; then insert the lower end within the grasp of the dies on theslide G; then admit steam to the cylinder to raise the mandrel N, as

denoted in red, fig. 2, and seen in fig. 5. As the mandrel, with theslides LL, descends, (bytherelcase of steam in the usual manner forcommon steam hammers) the lower inclined ends of the two slides L Lforce the dies together and compress the metal, as seen at 2', fig. 6.Continuing its descent the mandrel forces the compressed metal beforeit, drawing out the tube, as soon in fig. 2. Again raised, the slidesGbeing released, open as seen in fig.- 5, by the reaction of the springsI, as seen in fig. 3, the lever I1 acting as before described toturn thescrew S, draws down the plate 0 and the metaltubc thereto attached,feeding a certain portion of the tube between the dies, which upon thenext descent of the hammer is compressed and drawn in like manner asbeibre described, and so continuing until the whole tube has been inlike manner drawn out. At each downward movement the tube being drawn ispartially revolved by the operation of thc shaft R through the gearf,for a purpose which will be apparent to all persons skilled in similarwork. We have represented our machine as striking a blow upon the insideof the tube, and this We believe to be the best method of extending thetube, yet the mandrel maybe operated by apress or in various ways toextend the compressed portion of the tube. If the tube is notsufiieiently extended in the first operation it may be; again passedthrough the same machine by introducing dies of smaller diameter intothe slides G, or another machine of like construction with smaller diesmay be employed. j l

Having therefore thus full described our invention, what we claim as newand useful, and desire to secure by Letters Patent, is- I lVe claimextending metallic tubing, and reducing the thickness thereof, by firstapplying external pressure to the tube, which shall reduce its diameterand then internal pressure, which, while restoring or partially so, theprevious internal diameter of the tube, shall attenuate and elongate themetal in the manner and by means substantially as herein set forth.

H. A. SHIPMAN, A. B. HENDRYX. Witnesses:

Jenn H. SHUMWAY, A. J. Tnnurs.

